Carbon dioxide recovery device, carbon dioxide recovery method, plant growth method using carbon dioxide recovery method, and plant growth mechanism

Abstract

The carbon dioxide recovery device includes a storage portion formed by a partition portion separating the atmosphere and an internal space, and storing a liquid in which carbon dioxide is dissolved in the internal space. In addition, the carbon dioxide recovery device includes a suction part that lifts the liquid by sucking gas present in the internal space. The carbon dioxide recovery device further includes an accumulation unit that accumulates carbon dioxide recovered from a Tonicure vacuum space formed as the liquid is lifted.

Description

Technical Field

[0001] The present invention relates to a carbon dioxide recovery device, a carbon dioxide recovery method, a plant growth method using the carbon dioxide recovery method, and a plant growth mechanism. Background Art

[0002] As a measure to address global warming, there is a worldwide need to reduce the global environmental load by reducing carbon dioxide in the atmosphere. To this end, two things are required: reducing carbon dioxide emissions; and reducing the concentration of carbon dioxide in the atmosphere by recovering carbon dioxide present in the atmosphere. The concentration of carbon dioxide in the atmosphere is as low as about 400 ppm, and in order to reduce the concentration of carbon dioxide in the atmosphere, it is preferable to use a method that can minimize the emission of new carbon dioxide as the recovered energy.

[0003] Regarding carbon dioxide present in the atmosphere, it is necessary to focus on carbon dioxide as a gas present on the earth's surface. That is, carbon dioxide as a gas present on the earth's surface is the sum of carbon dioxide in the atmosphere and carbon dioxide in water such as the ocean that has dissolved a part of the carbon dioxide in the atmosphere. As an example of a means for removing carbon dioxide without emitting new carbon dioxide, there is a method of removing carbon dioxide via seawater or fresh water. A method of dissolving carbon dioxide contained in the atmosphere in seawater and fresh water and extracting carbon dioxide from seawater or fresh water by heating or depressurizing is known.

[0004] Patent Document 1 describes a carbon dioxide removal device for a fishpond that removes carbon dioxide dissolved in the seawater in the fishpond by depressurizing the seawater. To remove carbon dioxide from the seawater, the device disclosed in Patent Document 1 discharges carbon dioxide that has formed into bubbles in the depressurized space to the outside, and supplies the seawater from which carbon dioxide has been removed to a water tank. However, since this device has a nozzle and a control unit that needs to maintain the inside of the water tank in a depressurized state, the device has a complicated device configuration and a high device cost.

[0005] Citation List

[0006] Patent Document

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-259759 Summary of the Invention

[0008] Technical Problem

[0009] The present invention provides a device for recovering carbon dioxide in a liquid with a simple device configuration.

[0010] Technical Solution to Solve the Problem

[0011] To solve the above problems, the carbon dioxide recovery device includes: a storage unit that includes a partition wall separating the atmosphere and an internal space and stores a liquid in which carbon dioxide is dissolved in the internal space; a suction unit that lifts the liquid by sucking the gas present in the internal space; and an accumulation unit that accumulates the carbon dioxide recovered from the Torricellian vacuum space formed as the liquid is lifted.

[0012] Advantages of the present invention

[0013] It is possible to provide a device for recovering carbon dioxide in a liquid through a simple device configuration. Description of the drawings

[0014] Figure 1 shows a preferred embodiment of the present invention.

[0015] Figure 2 shows a first embodiment of the present invention.

[0016] Figure 3A shows the water vapor pressure and the Torricellian vacuum height in the first embodiment of the present invention.

[0017] Figure 3B shows the water vapor pressure and the Torricellian vacuum height in the first embodiment of the present invention.

[0018] Figure 4A shows the total head and the required power of the water lift pump in the first embodiment of the present invention.

[0019] Figure 4B shows the total head and the required power of the water lift pump in the first embodiment of the present invention.

[0020] Figure 5 shows a second embodiment of the present invention.

[0021] Figure 6 shows a third embodiment of the present invention.

[0022] Figure 7 shows a fourth embodiment of the present invention.

[0023] Figure 8 shows a fifth embodiment of the present invention.

[0024] Figure 9 shows a sixth embodiment of the present invention.

[0025] Figure 10 shows a seventh embodiment of the present invention.

[0026] ​​​​​​​​​​​​​Figure 11 shows the eighth embodiment of the present invention.

[0027] Figure 12 shows the ninth embodiment of the present invention. Detailed Description of the Invention

[0028] Hereinafter, the present invention will be described in detail by using preferred embodiments as examples. The present invention is not limited to the embodiments described below, and the scope of the present invention includes various modifications, improvements, etc. that can be made to the following embodiments within the gist of the present invention based on the general knowledge of those skilled in the art. As an example of the carbon dioxide recovery device of the embodiment, the storage unit includes a partition wall that separates the atmosphere and the internal space, and a liquid dissolved with carbon dioxide is stored in the internal space. In addition, the device includes a suction unit that lifts the liquid by sucking the gas present in the internal space. Further, the device includes an accumulation unit that accumulates the carbon dioxide recovered from the Torricelli vacuum space formed as the liquid is lifted.

[0029] The suction unit can recover carbon dioxide from the Torricelli vacuum space.

[0030] As an example of the structure of the storage unit, the storage unit may have a first opening and a second opening, and one of the openings may be disposed above the other opening in the vertical direction with respect to the liquid surface.

[0031] The liquid may be at least one of rainwater, river water, lake water, tap water, and seawater.

[0032] The present invention provides a carbon dioxide recovery method and device that recover carbon dioxide from a Torricelli vacuum (a vacuum space formed in the upper part in the vertical direction as water is lifted) by lifting a carbon dioxide solution such as rainwater, river water, lake water, tap water, or seawater.

[0033] By using the present invention, it is possible to recover the carbon dioxide in the atmosphere dissolved in rainwater, river water, lake water, tap water, or seawater by using a device having a simple structure. In addition, by utilizing the above-mentioned Torricelli vacuum and siphon principle, it is also possible to provide such a recovery device and recovery method that recover carbon dioxide from seawater or fresh water by reducing the pressure and circulate the seawater or fresh water in a decompressed state in the device.

[0034] ​As a means of recovering carbon dioxide in the atmosphere under a state of minimizing the environmental load caused by carbon dioxide emissions, carbon dioxide dissolved in rainwater, river water, lake water, or seawater is recovered by heating or depressurizing the rainwater or the like. Since rainwater has a large surface area in contact with the atmosphere, carbon dioxide in the atmosphere dissolves in rainwater under the equilibrium pressure state. In particular, the solubility of carbon dioxide in seawater is high. The solubility of carbon dioxide in water tends to be high at low temperatures and low at high temperatures. In addition, the higher the pressure, the higher the solubility of carbon dioxide; and the lower the pressure, the lower the solubility.

[0035] As a measure to address global warming, in order to reduce the amount of carbon dioxide in the atmosphere, it is necessary to effectively extract carbon dioxide while supplying a large amount of seawater or fresh water to / from the device. In order to recover carbon dioxide from seawater or fresh water with low energy consumption, it is desirable to extract carbon dioxide by depressurizing the seawater or fresh water.

[0036] For this purpose, seawater or fresh water is lifted, and carbon dioxide is recovered from the Torricelli vacuum (the vacuum space formed at the upper part as the water is lifted). More preferably, the siphon principle is used to circulate seawater or fresh water in the device. The Torricelli vacuum is a vacuum space created in the space above the height that is the limit position to which water can be lifted by depressurization. As is well known, the Torricelli vacuum is created based on the relationship between atmospheric pressure, the specific gravity of the solution, and the vapor pressure of the solution. At sea level, when water is lifted to a height greater than 10 meters, a Torricelli vacuum is formed. Since carbon dioxide dissolved in seawater or fresh water is released as a gas into the Torricelli vacuum space, carbon dioxide is recovered into the recovery tank by using a vacuum pump to discharge the carbon dioxide.

[0037] The siphon principle can be used to circulate the lifted seawater or fresh water in the device under a depressurized state. As long as the water supply path and the drainage path are at the same position height, the pressure density of the seawater in the water supply path due to its own weight and the pressure density of the seawater in the drainage path are the same pressure density. If the water level of the water supply surface is higher than the water level of the drainage surface, the seawater flows from the water supply side to the drainage side without the power assistance of a spray pump or the like. If the water supply surface and the drainage surface are at the same height, the seawater can circulate in the device when the spray pump provides only a little power assistance.

[0038] Preferred embodiments will be described below. Referring to Figure 1 , as an example, a system using fresh water dissolved with CO2 will be described.

[0039] When comparing the fresh water 300 on the water supply side and the fresh water 301 on the water discharge side, as shown in the figure, the position height of the water surface of the fresh water 300 is greater than the water surface height of the fresh water 301. The carbon dioxide recovery device according to the present embodiment includes a CO2 release tank 101 as a storage unit, the storage unit includes a partition wall that separates the atmosphere and the internal space, and the storage unit stores a liquid dissolved with carbon dioxide in the internal space.

[0040] The water lift pipe 102, the CO2 release tank 101, and the drain pipe 103 form a flow path, and the fresh water 300 flows along the flow path. When the vacuum pump 107 as a suction unit decompresses the inside of the CO2 release tank 101, the fresh water 300 and the fresh water 301 are lifted into the flow path.

[0041] When the vacuum pump 107 continuously decompresses the inside of the CO2 release tank 101, the fresh water 300 can be lifted to the solution position height H1. As a result, a vacuum space 104 that is not filled with the fresh water 300 and is called a "Torricelli vacuum" is created in the CO2 release tank 101.

[0042] The upper limit of the solution position height H1 is determined by the relationship between the following factors. That is, the factors are the pressure density of the fresh water 300 existing between the solution position height H1 and the solution position height H2, the vapor pressure of the fresh water 300 generated according to the degree of vacuum of the vacuum space 104, and the atmospheric pressure generated at the water surface at the solution position height H2.

[0043] Figure 3A Shows the relationship between the vapor pressure of water and temperature. When the temperature of the fresh water 300 is 20 °C, the vapor pressure is about 2.5 kPa, and when the pressure of the vacuum space 104 is 2.5 kPa, the fresh water 300 in the CO2 release tank 101 boils. Since the solution position height H1 is determined by the boiling caused by the decompression of the fresh water 300, for example, the solution position height H1 at sea level is about 10 m, and the solution position height cannot be greater than this value.

[0044] As Figure 3A shown, the vapor pressure of fresh water changes according to temperature. Therefore, due to the boiling caused by the decompression of the fresh water 300, the solution position height H1 changes to the Figure 3B shown height according to the temperature of the fresh water 300 in the CO2 release tank 101. For example, when the water temperature is 60 °C, the vapor pressure is about 20 kPa, and the solution position height H1 is about 8 m.

[0045] Since seawater or fresh water releases carbon dioxide at a temperature lower than the boiling point, as long as the solution position height H1 is a height corresponding to a temperature lower than or equal to the boiling point of fresh water.

[0046] In the example, the solution position height H1 is the following height: Even when the temperature of the fresh water 300 is 40 °C, the fresh water 300 can circulate in the device. The device structure can be such that even when the height of the drainage surface changes, the fresh water 300 can circulate in the device, and a vacuum space 104 exists in the CO2 release tank 101. For example, the structure can be such that the drain port 113 and the fresh water 301 do not come into contact with each other, and the solution position height H2 is not affected by the water surface height of the fresh water 301. The drain port 113 serves as an opening provided in the storage section.

[0047] Carbon dioxide in the atmosphere dissolves in seawater and fresh water existing in nature. The fresh water 300 present in the CO2 release tank 101, the water lift pipe 102, and the drain pipe 103 releases carbon dioxide and other gas molecules dissolved in the fresh water 300 into the vacuum space 104 by decompression. The carbon dioxide released into the vacuum space 104 can be accumulated in the CO2 recovery tank 110, which is a carbon dioxide accumulation section, by a vacuum pump 107. Carbon dioxide can be accumulated in the accumulation section together with other gas molecules.

[0048] When the device is configured to store carbon dioxide and other gas molecules recovered simultaneously with carbon dioxide in the CO2 recovery tank 110, the device can additionally have the following structure. That is, a purifier that increases the carbon dioxide concentration by removing dissolved gas molecules other than CO2 can also be provided, and the carbon dioxide can be stored in the CO2 recovery tank 110 after being purified. The recovered carbon dioxide can be fixed by plants for plant growth. In this case, instead of the CO2 recovery tank 110, a plant growth section having a plant growth space also serves as a carbon dioxide accumulation section. In order for the recovery tank to fix CO2, a substance that performs physical adsorption such as zeolite, activated carbon, or MOF (metal-organic framework), or a substance that performs chemical adsorption such as amine can be used.

[0049] It is desirable to use green power with a small environmental load as the power for driving the water lift pump 106 and the vacuum pump 107 described below. However, commercial power can be used. The water lift pump 106 serves as an auxiliary circulation mechanism for assisting the circulation of the CO2 solution.

[0050] When a certain amount of fresh water 300 and fresh water 301 are filled inside the CO2 release tank 101, due to the siphon principle, the fresh water 300 continuously flows towards the fresh water 301. For example, a water lift pump (not shown) can be used as a method for initially lifting the fresh water 300 or the fresh water 301 to the CO2 release tank 101. The method is not limited.

[0051] The positional height relationship between the drainage outlet of the water lift pipe 102 in the CO2 release tank 101 and the inlet of the drain pipe 103 is as follows: the height of the water supply port of the drain pipe 103 is greater than the height of the drainage outlet of the water lift pipe 102. However, this is an example and not restrictive.

[0052] In the example, the drainage outlet 113 is in contact with the water surface. However, the drainage outlet 113 and the water surface may have a positional relationship such that there is a space between them. If the drainage outlet 113 and the water surface have a positional relationship such that there is a space between them, the height of the solution position height H2 is the end face of the drainage outlet 113.

[0053] In this embodiment, carbon dioxide is recovered from fresh water. However, for example, carbon dioxide can be recovered from seawater, rainwater, river water or lake water. As included in the embodiments described below, it is conceivable that the liquid can be circulated in the system to recover CO2 from the atmosphere, and the CO2 recovered in the liquid can be recovered by using Torricelli vacuum. In this case, since chemical bonding is used to recover CO2, an alkaline aqueous solution such as an amine solution can be used instead of pure water, and the efficiency can be improved by recovering CO2 using a fluorine-based active liquid with high CO2 solubility. Considering viscosity, the fluorine-based active liquid with high CO2 solubility may have substituents and is selected from fluorocarbons that may have a branched structure and / or a cyclic structure. Examples include perfluorobromooctane, perfluorodecalin, Fluorinert FC-3283, perfluorobutyl perfluorotetrahydrofuran, perfluoro-1-isopropoxyhexane, perfluoro-1,4-diisopropoxybutane, and hydrofluoroethers (Novec 7100, Novec7300). However, these examples do not limit the scope of the present invention. Mixing another liquid to adjust the physical properties of the liquid is effective.

[0054] First Embodiment

[0055] Figure 2 The first embodiment of the present invention is shown.

[0056] Seawater 100 is lifted to the CO2 release tank 101 by using a water lift pump 106 attached to the water lift pipe 102. Inside the CO2 release tank 101, there is a vacuum space 104 that is not filled with seawater 100, and the vacuum space 104 is depressurized relative to the atmospheric pressure by a vacuum pump 107 via a steam filter 108.

[0057] The seawater 100 in the drain pipe 103 has a pressure density due to the seawater 100 existing between the solution position heights H1 and H2 and gravity. The seawater 100 lifted into the CO2 release tank 101 is discharged as follows. That is, due to the relationship between the aforementioned pressure density, the vapor pressure of the seawater 100 generated in the vacuum space 104, and the atmospheric pressure generated at the seawater surface at the solution position height H2, the seawater flows in the drain pipe 103 in the direction of the arrow shown in the figure. As a result, the seawater is discharged from the drain port 113.

[0058] Since the seawater 100 lifted from the water lift pipe 102 and the seawater 100 discharged from the drain pipe 103 have the same pressure density, the water lift pump 106 can lift water with a small amount of electricity in the same manner as the siphon principle. Figure 4A and Figure 4B Shows the relationship between the total head of the water lift pump and the power consumption.

[0059] When the water lift pump 106 lifts water at 600 L / min, for example, it is necessary to operate the water lift pump 106 at 2600 revolutions per minute to lift the water 15 meters, and the power consumption at this time is about 3.5 kilowatts. It is sufficient to operate the water lift pump 106 at 1900 revolutions per minute to lift the water 2 meters, and the power consumption at this time is about 1.5 kilowatts. By utilizing the siphon principle, the seawater 100 circulates in the device with the following power consumption, with which the water lift pump 106 only slightly lifts the water. In order for the water lift pump 106 to lift water with a small amount of electricity by utilizing the siphon principle, it is desirable that the seawater 100 does not boil due to decompression. However, since carbon dioxide can be recovered by decompression while maintaining the circulation of the seawater 100 in the device even if the seawater 100 boils, the structure of the device is not limited to the structure that prevents the seawater 100 from boiling.

[0060] In the example, the solution position height H1 is the height such that the seawater 100 can circulate in the device even when the temperature of the seawater 100 is 40°C. The device is constructed such that the seawater 100 can circulate in the device even if the height of the seawater surface changes due to the tidal difference of the seawater, and the vacuum space 104 exists in the CO2 release tank 101.

[0061] As described above, in nature, oxygen, nitrogen, and carbon dioxide in the atmosphere dissolve in seawater and fresh water, and in particular, carbon dioxide dissolves in much larger amounts than other atmospheric molecules. The seawater 100 present in the CO2 release tank 101, the water riser 102, and the drain pipe 103 releases carbon dioxide and other gas molecules dissolved in the seawater 100 into the vacuum space 104 by reducing the pressure. The carbon dioxide and other gas molecules released into the vacuum space 104 are temporarily recovered into the CO2 buffer tank 105 by the vacuum pump 107 via the steam filter 108 having a mesh structure for removing water vapor.

[0062] The carbon dioxide recovered into the CO2 buffer tank 105 and other gas molecules recovered simultaneously are pressurized by the pressure pump 109 to a pressure higher than the atmospheric pressure and stored in the CO2 recovery tank 110. The water that the steam filter 108 fails to remove accumulates in the CO2 buffer tank 105. Since a large amount of carbon dioxide dissolves in the water accumulated in the CO2 buffer tank 105, the carbon dioxide is released from the accumulated water by heating the accumulated water using the buffer tank heating mechanism 114. The buffer tank heating mechanism 114 is a heater that is heated using electricity. It is desirable that the buffer tank heating mechanism 114 uses green electricity. However, as long as there is no problem with the carbon dioxide recovery balance, commercial electricity can be used.

[0063] The CO2 buffer tank 105 has a mechanism (not shown) for discharging the water accumulated therein.

[0064] In this embodiment, the buffer tank heating mechanism 114 releases carbon dioxide from the water accumulated in the CO2 buffer tank 105. On the other hand, carbon dioxide can be released from water by reducing the pressure. For example, the pressure pump 109 can reduce the pressure inside the CO2 buffer tank 105.

[0065] This embodiment is configured to store carbon dioxide and other gas molecules recovered simultaneously with carbon dioxide in the CO2 recovery tank 110. On the other hand, a purifier for increasing the carbon dioxide concentration by removing impurity gas molecules can be provided, and the carbon dioxide can be stored in the CO2 recovery tank 110 after being purified.

[0066] The positional height relationship between the drainage port of the water riser 102 in the CO2 release tank 101 and the water inlet of the drain pipe 103 is such that the height of the water supply port of the drain pipe 103 is greater than the height of the drainage port of the water riser 102. However, this is only an example and is not restrictive.

[0067] In this embodiment, the drain opening 113 is in contact with the seawater surface. However, the drain opening 113 and the seawater surface may have a positional relationship such that there is a space between the two. If the drain opening 113 and the seawater surface have a positional relationship such that there is a space between the two, the height of the solution position height H2 is the end face of the drain opening 113. The device is configured such that even if the height of the seawater surface changes due to the tidal difference of the seawater, the seawater 100 can circulate in the device, and a vacuum space 104 exists in the CO2 release tank 101.

[0068] In this embodiment, carbon dioxide is recovered from seawater. However, carbon dioxide can be recovered from fresh water, or for example, from rainwater / river water or lake water.

[0069] Second Embodiment

[0070] Figure 5 The second embodiment of the present invention is shown.

[0071] The differences from the first embodiment of the present invention will be described.

[0072] The heating mechanism 111 for heating the seawater 100 is disposed in the CO2 release tank 101. Since it is desirable that the heating mechanism 111 uses green energy with a small environmental load, the heating mechanism 111 is heated by using a solar panel 112. The solar panel 112, as a solar water heater 112, may have a configuration such that when the warm water heated by solar heat energy circulates between the solar water heater 112 and the heating mechanism 111, the seawater 100 is heated. As long as the carbon dioxide recovery balance can be achieved, the heating mechanism can use commercial power.

[0073] The positional height relationship between the drain opening of the water lift pipe 102 and the water inlet of the drain pipe 103 in the CO2 release tank 101 is such that the height of the water supply port of the drain pipe 103 is greater than the height of the drain opening of the water lift pipe 102. The heated seawater 100 is discharged from the water inlet of the drain pipe 103 disposed in the upper part of the CO2 release tank 101 by convection.

[0074] Third Embodiment

[0075] Figure 6 The third embodiment of the present invention is shown.

[0076] In this embodiment, the liquid is seawater, and a first opening that is an outward opening of the water lift pipe 102 is immersed in a first seawater portion represented as seawater 200. Further, a second opening that is an outward opening of the drain pipe 103 is immersed in a second seawater portion that is separated from the first seawater portion by a partition portion, has a seawater surface whose height changes compared to the seawater surface of the first seawater portion due to the tides of the ocean, and is represented as seawater 100.

[0077] Differences from the first embodiment of the present invention will be described. The structure is such that a height difference between a water supply surface and a drainage surface is generated by utilizing the tidal difference of seawater. As is well known, the tidal difference in the seas of Japan is about 2 meters, for example, on the Pacific side. Seawater 100 is connected to the open sea, and seawater 200 is a seawater pond separated from seawater 100 by a partition portion 201. The partition portion 201 has a height such that the partition portion 201 is below sea level when seawater 100 is on the flood tide and serves as a partition wall when on the ebb tide.

[0078] By making the high tide level 202 higher than the partition portion 201, seawater 100 can flow over the partition portion 201 in the direction of arrow 204 to seawater 200, so that seawater 200 and seawater 100 have the same water level.

[0079] Since the low tide level 203 is lower than the partition portion 201, the water level of seawater 200 is higher than the water level of seawater 100, and seawater 200 is lifted to the CO2 release tank 101 by the siphon principle and then discharged from the drain port 113. The degree of vacuum in the vacuum space 104 is such that seawater 200 can have a sufficient sea level at which seawater 200 can circulate in the device, the vacuum pump 107 discharges air, and carbon dioxide is recovered.

[0080] In this embodiment, the water lift pump 106 in the first embodiment is not provided. However, this is not a limitation, and a water lift pump can be provided as an auxiliary circulation mechanism.

[0081] Fourth Embodiment

[0082] Figure 7 The fourth embodiment of the present invention is shown.

[0083] The carbon dioxide recovery device according to this embodiment includes a generator that generates electricity by using the flow of a liquid flowing into and out of a storage portion.

[0084] Differences from the first embodiment of the present invention will be described. Freshwater 300 is collected rainwater, river water, or lake water, and carbon dioxide in the atmosphere is dissolved in the freshwater 300.

[0085] Since the water level of fresh water 300 is higher than that of fresh water 301, fresh water 300 is lifted to the CO2 release tank 101 by the siphon principle and then discharged from the drain port 113. The degree of vacuum in the vacuum space 104 is such that water 300 can have a sufficient water level for water 300 to circulate in the device, and the vacuum pump 107 discharges air.

[0086] The generator 302 is arranged in the flow path of the drain pipe 103 and generates electricity by utilizing the height difference between fresh water 300 and fresh water 301. The vacuum pump 107 and the pressure pump 109 are driven by the electricity generated by using the generator 302. In the present embodiment, the vacuum pump 107 and the pressure pump 109 are driven by the electricity generated by using the generator 302. However, in the case where the generator 302 is not provided, the vacuum pump 107 and the pressure pump 109 can be driven by using commercial electricity.

[0087] Fifth Embodiment

[0088] Figure 8 Illustrates the fifth embodiment of the present invention.

[0089] In the carbon dioxide recovery device according to the present embodiment, a heating mechanism for heating the liquid is arranged in the internal space of the storage unit. As an additional configuration, the device includes a spraying mechanism that sprays or drips a liquid to spray the liquid dissolved with carbon dioxide in the Torricelli vacuum space.

[0090] The differences from the first embodiment of the present invention will be described. The device is configured such that a fog mechanism 401 for atomizing seawater 100 is arranged in the CO2 release tank 101. The shower mechanism 401 has a plurality of small-diameter holes allowing seawater 100 to pass through, and sprays the lifted seawater 100 by using the self-weight of seawater 100. Since the surface area of seawater 100 increases during spraying, the efficiency of carbon dioxide release is improved.

[0091] In the present embodiment, the heating mechanism 111 is arranged at the position shown in the figure, and the carbon dioxide release efficiency is further improved by heating seawater 100 before spraying seawater 100. However, the heating mechanism 111 can be omitted. The device can have a nozzle for spraying water from the water lift pipe into the CO2 release tank 101 instead of the spraying mechanism 401.

[0092] The solution position height H1 is the water surface height of seawater 100 on the drain path side in the CO2 release tank 101. Due to the relationship among the degree of vacuum in the CO2 release tank 101, the pressure density of seawater 100 on the drain path side, and the atmospheric pressure, the solution position height H1 is the height at which seawater 100 is discharged passively.

[0093] In this embodiment, seawater 100 is used. However, fresh water may be used, and the device may have a configuration that is a combination of the configurations described in the third and fourth embodiments.

[0094] Sixth Embodiment

[0095] Figure 9 The sixth embodiment of the present invention is shown.

[0096] The differences from the first embodiment of the present invention will be described. The sixth embodiment has a configuration in which a floating mechanism floating on the water surface is disposed in the configuration of the first embodiment. By disposing a floating mechanism floating on the water surface, even if the seawater level changes due to tidal force, the change in the height relationship between the carbon dioxide recovery device and the solution position height H1 is reduced. In this embodiment, the device is configured to be installed on a ship. The device may have a configuration that is a combination of the configurations described in the second or fifth embodiment.

[0097] Seventh Embodiment

[0098] Figure 10 The seventh embodiment of the present invention is shown.

[0099] In the carbon dioxide recovery device according to this embodiment, a liquid is allowed to flow between a water storage tank and a storage unit via the water storage tank, the water storage tank receiving pressure generated by the atmosphere, lifting and storing seawater and being different from the storage unit.

[0100] The differences from the first embodiment of the present invention will be described. By providing a temporary water lifting pool 601 that is different from the storage unit and configuring the drain port 113 not to contact the seawater surface, the carbon dioxide recovery device has a configuration such that the relationship between the device and the solution position height H1 does not change due to a change in the water level caused by the tidal force of the seawater.

[0101] Seawater 100 is lifted to the temporary water lifting pool 601 by using a water lifting pump 106, and seawater 100 is lifted from the temporary water lifting pool 601 to the CO2 release tank 101 via a water lifting pipe 102. The water supply port of the water lifting pump is at a height such that the water lifting pump can pump water even at low tide, and the drain port 113 is at a height such that the drain port 113 does not contact the seawater surface even at high tide. Although it is desirable for the drain port 113 to be at a height such that it does not contact the seawater surface even at high tide, if the change in the height relationship between the carbon dioxide recovery device and the solution position height H1 is small, the drain port 113 may contact the seawater surface.

[0102] The temporary water lifting pool 601 has a structure that enables the seawater 100 stored therein to receive pressure based on atmospheric pressure. In the present embodiment, the temporary water lifting pool 601 has the following structure: its upper part is open to the atmosphere, such that the seawater 100 in the temporary water lifting pool 601 directly receives atmospheric pressure. However, for example, a lid floating on the seawater 100 in the temporary water lifting pool 601 may be provided to cover the seawater 100.

[0103] The water accumulated in the CO2 buffer tank 105 returns to the temporary water lifting pool 601 via Figure 9 A and A' shown. However, the water can be released into the ocean. The device may have a structure that is a combination of the structures described in the second, fifth, and sixth embodiments.

[0104] Eighth Embodiment

[0105] Figure 11 Illustrates the eighth embodiment of the present invention.

[0106] The carbon dioxide recovery device according to the present embodiment has a carbon dioxide dissolution mechanism for dissolving carbon dioxide in the atmosphere into a liquid.

[0107] The differences from the first embodiment of the present invention will be described. This embodiment includes a CO2 dissolution tank 702 for dissolving carbon dioxide in the atmosphere in a solvent. The solvent recovery tank 701 stores the solvent, and the water lift pump 106 included in the primary water lift pipe 703 lifts the solvent to the CO2 dissolution tank 702. The CO2 dissolution tank 702 has a spraying mechanism 401 therein, and the spraying mechanism 401 has a structure with a plurality of small-diameter holes that allow the solvent to pass through, and sprays the solvent into the CO2 dissolution tank 702 by using the self-weight of the solvent.

[0108] The blower 706 blows the atmosphere including carbon dioxide into the CO2 dissolution tank 702, and since the surface area of the solvent increases during spraying, the atmosphere including carbon dioxide is effectively dissolved in the solvent. The air outlet 707 includes a mesh filter that prevents the solvent from leaking from the CO2 dissolution tank 702, and discharges the unnecessary atmosphere in the CO2 dissolution tank 702 to the outside.

[0109] The sprayed solvent accumulates in the lower part of the CO2 dissolution tank 702, and the solvent at a certain level or above is discharged to the solvent recovery tank 701 through the primary drain pipe 705. The primary circulation system of the solvent is formed by the solvent recovery tank 701, the primary water lift pipe 703, the CO2 dissolution tank 702, and the primary drain pipe 705.

[0110] By using the configuration described in the first embodiment, a part of the solvent accumulated in the lower part of the CO2 dissolution tank 702 is lifted to the CO2 release tank 101 via the water lift pipe 102, and carbon dioxide is recovered from the solvent by depressurization. A secondary circulation system is formed by the water lift pipe 102, the CO2 release tank 101, the drain pipe 103, and the solvent recovery tank 701. The amount of the solvent circulated in the primary circulation system is larger than the amount of the solvent circulated in the secondary circulation system. In the present embodiment, the primary circulation system is configured such that the amount of the solvent circulated in the primary circulation system is 10 times the amount of the solvent circulated in the secondary circulation system.

[0111] The liquid generated by depressurizing the solvent gradually accumulates in the CO2 buffer tank 105. Since a large amount of carbon dioxide is dissolved in the liquid, when the buffer tank heating mechanism 114 heats the liquid, carbon dioxide is released from the accumulated liquid. The liquid that has been degassed by heating is discharged to the solvent recovery tank 701 via the paths A and A' shown in Figure 10 FIG.

[0112] In the present embodiment, seawater is used as the solvent for dissolving atmospheric carbon dioxide. However, this is not restrictive, and the solvent can be fresh water, an alkaline solution, or a fluorine-active solution. The device configuration in the present embodiment can be a part of a salt production process such as a flow-down type salt pan. Since the device configuration of the present embodiment has a high degree of freedom, the device can be installed near a plastic greenhouse that is a plant growth space, and the device can be used as a carbon dioxide supply device for plant growth. That is, a plant growth mechanism can be configured, which includes a plant growth part having a plant growth space therein, and the above-mentioned carbon dioxide recovery device. The plant growth mechanism is configured such that the above-mentioned accumulation part and the plant growth space communicate with each other, and carbon dioxide is supplied from the accumulation part to the plant growth space. The plant growth mechanism can recover carbon dioxide by using the above-mentioned carbon dioxide recovery method, and can grow plants by supplying the recovered carbon dioxide to the plant growth space where the plants are located.

[0113] As the power for operating the device, in consideration of the carbon dioxide recovery balance, it is desirable to use green power generated by solar power generation, hydroelectric power generation, or geothermal power generation.

[0114] Ninth Embodiment

[0115] Figure 12 Illustrates the ninth embodiment of the present invention.

[0116] The differences from the first embodiment of the present invention will be described. The lower surface of the CO2 release tank 101 is open, and the CO2 release tank 101 is provided on the surface of the seawater 100. When the vacuum pump 105 decompresses the inside of the CO2 release tank 101, the seawater 100 is lifted into the CO2 release tank 101, and a vacuum space 104 is formed.

[0117] In this embodiment, the water supply pipe 801 and the water supply pump 802 introduce the seawater 100 existing outside the CO2 release tank 101 into the CO2 release tank 101. By spraying the seawater 100 toward the upper part of the CO2 release tank 101, the seawater 100 is discharged from the CO2 release tank 101 while causing the convection of the seawater 100 in the CO2 release tank 101. On the other hand, the water supply pipe 801 and the water supply pump 802 can be omitted, and the seawater 100 can be supplied to and discharged from the CO2 release tank by natural convection.

[0118] The seawater 100 is sprayed by the water supply pump 802. However, a heating mechanism for heating the seawater 100 can be provided, the heated seawater 100 can be introduced into the CO2 release tank 101, and the seawater 100 can be discharged from the CO2 release tank 101 by thermal convection.

[0119] The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the gist and scope of the present invention. Therefore, the appended claims are attached to disclose the scope of the present invention.

[0120] This application claims the priority of Japanese Patent Application No. 2022-187567 filed on November 24, 2022, the entire contents of which are incorporated herein by reference.

[0121] List of Reference Numerals

[0122] 100 Seawater

[0123] 101 CO2 Release Tank

[0124] 102 Water Lifting Pipe

[0125] 103 Drain Pipe

[0126] 104 Vacuum Space

[0127] 105 CO2 Buffer Tank

[0128] 106 Water Lifting Pump

[0129] 107 Vacuum Pump

[0130] 108 Steam Filter

[0131] 109 Pressure Pump

[0132] 110 CO2 cylinder

[0133] 111 Heating mechanism

[0134] 112 Solar panel

[0135] 113 Drain outlet

[0136] 114 Buffer tank heating mechanism

[0137] Height of H1 solution position

[0138] Height of H2 solution position

Claims

1. A carbon dioxide recovery device, comprising: A storage unit, which includes a partition wall separating the atmosphere and the internal space and stores a liquid dissolved with carbon dioxide in the internal space; A suction unit, which lifts the liquid by sucking the gas present in the internal space; and An accumulation unit, which accumulates the carbon dioxide recovered from the Torricelli vacuum space formed as the liquid is lifted.

2. The carbon dioxide recovery device according to claim 1, wherein, The suction unit recovers the carbon dioxide from the Torricelli vacuum space.

3. The carbon dioxide recovery device according to claim 1, wherein, The storage unit has a first opening and a second opening, and one of the openings is disposed above the other opening in the vertical direction relative to the liquid surface.

4. The carbon dioxide recovery device according to claim 1 or 2, wherein the carbon dioxide recovery device includes an auxiliary circulation mechanism for assisting the circulation of the liquid.

5. The carbon dioxide recovery device according to claim 1 or 2, wherein, The liquid is at least one of rainwater, river water, lake water, tap water, and seawater.

6. According to the carbon dioxide recovery device of claim 3, Among them, The liquid is seawater, wherein the first opening is immersed in a first seawater portion, and wherein the second opening is immersed in a second seawater portion, the second seawater portion is separated from the first seawater portion by a partition portion, and has a seawater surface whose height changes compared to the seawater surface of the first seawater portion due to the tides of the ocean.

7. The carbon dioxide recovery device according to claim 1 or 2, wherein the carbon dioxide recovery device includes a generator, and the generator generates electricity by using the flow of the liquid flowing into and out of the storage unit.

8. The carbon dioxide recovery device according to claim 1 or 2, wherein A heating mechanism for heating the liquid is arranged in the internal space of the storage unit.

9. The carbon dioxide recovery device according to claim 1 or 2, wherein the carbon dioxide recovery device includes a spraying mechanism, and the spraying mechanism sprays or drips the liquid to spray the liquid dissolved with carbon dioxide in the Torricelli vacuum space.

10. The carbon dioxide recovery device according to claim 1 or 2, wherein the carbon dioxide recovery device includes a floating mechanism floating on fresh water or seawater.

11. The carbon dioxide recovery device according to claim 1 or 2, wherein, A water storage tank that receives pressure due to atmospheric pressure, lifts and stores seawater and is different from the storage unit allows the liquid to flow between the water storage tank and the storage unit.

12. The carbon dioxide recovery device according to claim 1 or 2, wherein the carbon dioxide recovery device includes a carbon dioxide dissolution mechanism for dissolving carbon dioxide in the atmosphere in the liquid.

13. The carbon dioxide recovery device according to claim 1 or 2, wherein, The accumulation unit accumulates carbon dioxide at a pressure equal to or higher than atmospheric pressure.

14. The carbon dioxide recovery device according to claim 1 or 2, wherein, The accumulation unit includes a tank for accumulating carbon dioxide, and includes a heating mechanism for heating the water accumulated in the tank.

15. The carbon dioxide recovery device according to claim 1 or 2, wherein, The accumulation unit includes a tank for accumulating carbon dioxide, and releases carbon dioxide from the water accumulated in the tank by decompressing the inside of the tank.

16. A plant growth mechanism, comprising: A plant growth portion, which has a plant growth space; and The carbon dioxide recovery device according to claim 1 or 2, wherein the accumulation unit and the plant growth space communicate with each other, and carbon dioxide is supplied from the accumulation unit to the plant growth space.

17. A carbon dioxide recovery method, comprising: A suction step performed by a suction unit, which lifts a liquid dissolved with carbon dioxide by sucking gas present in an internal space of a storage unit, the storage unit including a partition wall that separates the atmosphere from the internal space and storing the liquid in the internal space; and An accumulation step performed by the storage unit, which accumulates carbon dioxide recovered from a Torricelli vacuum space formed as the liquid is lifted.

18. A method for growing plants, comprising: A step of recovering carbon dioxide by performing the carbon dioxide recovery method according to claim 17; and A plant growth step of growing plants by supplying the recovered carbon dioxide to a plant growth unit having a plant growth space in which the plants grow.

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